Sewing-machine



(No Model.)

A s. R. SARGBNT.

` SE WING MACHINE No. 287,868. Patented Nov. 6, 1883.

N. PETERS Phuiefumagnpmr. wahingm. n.6.

NITED? 'STATES-` PATENT (rlricl,V

SEWINc--MAcI-UNE.`

rSPECIFICACLION forming part of Letters Patent No. 287,868, datedNovember 6, 1883.V l

To au whom it may concern:

13e it known that I, SAMUEL R. SARGENT, of Terre Haute, county of Vigo,and State of Indiana, have invented or discovereda new and usefulImprovement in Sewing-Machines;

and I do hereby declare the following to be' av full, clear, concise,and exact description therevation described with reference to theposition a top planview of the .feed-bar and plate or of the parts in acomplete machine. Fig. 3 is bar which supports it; and Figfi is alongitudinal sectional view of the shaft employed for operating the feedmechanism, the central part of the shaft being broken away. 1

My present invention relates to certain improvements iin-the mechanismemployed for imparting feed in sewing-machines; and it consists, ingeneral terms, of certain combinations of a feed-bar, a* movabletwo-part frame for carrying `such bar, cam and spring mech: anism formoving the frame, means forradj ustingthe cams to vary the feed, andalso in the construction of such parts or devices, as hereinafter morefully described and claimed.

In the drawings, A represents a metallic plate, which is secured by lugsaand screwsa to the under side orface of a sewing-machine bed-plate,-.D,depending 'therefrom in a vertical plane transverse to the machine andat,

right angles tothe shaft B, which extends 10ngitudinally under thetable, and has an end bearing in the plate A bymeans of a circular head,B, secured on the shaft, which. head rotates in` 'a` similarly-shapedopening. in the plate, the faces of the plate and head being iiush or inthe same plane; also, additional bearings may be provided for the shaftat any desi-red points in its length by hangers depending from bed-plateD.' A portion only of this bed-plate is shown, and this, as well as vthemechanism usually mounted above it for inanipulating the upper thread,also the shuttle mechanism for carrying the under thread, and

y Application filed January S, 1883. (N o model.)

the driving mechanism, may be of any suit` able or well-known forml andconstruction; and therefore I doV not deem it necessary to show the sameherein, but have shown and described mechanism adapted for these severalpurposes in the subject-matter of other appli-- cations iiled even dateherewith, serial numbers 81,-247 and 81,250. I-n` connection with myimproved feed mechanism, I make use of a new and improved constructionof lfeed-bar, C, having a serrated upper face, consisting of afront faceor part, c, two side faces or partsz c c, extending back-y ward oneither side of the central needle-pas sa e cand anarrow serrated face orart c2, prolonged in the central line of the needleopening beyond thetermination of the side serrations. The faces c c. c are formed on theupper end of the body part of the bar, and the face c2 `upon an arm, c,which branches from such body, but is integral with or` rigidly securedto the body. Consequently all parts of the serrated face take feedmotion from the bar in unison. They are all, by preference, in a commonplane 5 but the narrow strip or face c2, extending beyond or in rear ofthe two side faces, c c', forms in effect a pivotal or turning turnedwith equal ease in anyand all direc tions, Veither at angles or in longorshort curves, so that fancy scroll-sewing may be Y done with easeandfacility. By providing serrated faces c c on both sides of theneedle, puckering and drawing of the'cloth are prevented; and inconnection with this advantageI also'secure, by means of theprolongednarrow part c2, all the advantages in turning the cloth-heretoforesecured when the feedbar extends along one side only of the needle.rIhis feature of construction-namely, com- .binino` with-the twosideparts, c c', a narrow n part, c2, prolonged beyond the side parts in thecentral line-is an yimportant and useful improvement. passage below thefabric by a projection, a2, extending upward from the edge of the'plateA, in which is a vertical hole or passage, c3, leading downwardV by agroove in the back face' or shuttle-face of plate A.' The needle,

in its downward movement, enters this hole a3, 'and is thus protected. yl l The space ca between the front andv back The needle is guarded initsr IOO 2 :leases serrations, c c`, is sufficient in length to reeeivethe projectionr, and also to afford range of feed movement, as may berequiredin practice.

The feed-bar C is secured at its lower end, by screws c, and by dovetailtongue-andgroove connection c, to a bar, E, which is seated in a recess,a, across the top of plate A, and this bar is held in place in suchlrecess, with provision for horizontal and vertical movement, byguide-lugs A', secured to plate A at or near its edges, between which isformed the guide-boxes ai".

In one end of the bar E, corresponding to the side c of the feed-bar, ismade a slot, c, through which is passed a pivot-pin, c', thus preventingvertical movement of this end of the bar, but providing for horizontalor endwise movement. The other end of bar E is free to move bothvertically and endwise in its guide a. This vertical movement iseffective in pressing and releasing the fabric by the serrated feed-bar,and it is imparted by a cam, l, secured on rotary shaft B, which cambears against a roller, fi', mounted on an ear or lug, if, which latterextends downward from the yielding spring-bar I. This spring-bar issecured to the lower edge of bar E at or near one end by a screw, li. Atthe opposite end an adjusting screw, i, passes downward through the barE and presses against the upper face ofspring I. By turning thisadjusting-screw the two bars E and I may be separated at pleasure, andas the bearing of roller i upon ca m i prevents.downward movement of thespring-bar, the bar E and feed C will be raised by such adjustment,thereby determining the distance that the feed-bar shall be raised abovethe face-plate under the movement imparted by the cam. Theadjustingscrew if* is located under the sliding face-plate D, so that bymoving such plate the screw may be reached easily by the operator. Theperiphery of cam yi is formed by preference with a gradial lift, as ata, and from this lift, in the direction of rotation, the periphery iscircular in form, or nearly so, the length of such circular arecorresponding with that part of the rotation of the shaft employed ineffecting the forward movement of the feed-bar, as presently described.At or about the termination of such forward movement the radius of thecam is reduced, as at a', permitting the feed-bar to fall preliminary tobeing moved backward. In order, however, to insure prompt downwardmovement of the feed-bar, a contractile spring, mf, is secured at oneend to the lower edge of Vbar E, as at m', and at the other end to the(platen, as at m2. Forward feed movement of the bars E and C is impartedby sleeve-cam R, which is secured on shaft B, and bears against aroller, 7L, pivoted between the forked arms 7L h of the bent armII,'which latter is rigidly secured to and extends downward from the barE. Forward motion is given by this cam R as the roller 7L travels fromthe lowest to the highest part on the surface, (say from o to o,') or,more properly speaking, the forward movement is given by this part ofthe cam pressing its rotation upon the roller which is held in or nearthe horizontal plane of the cam. In order that this throw may occur inproper relation to the vertical lift imparted by cam z', the two camsare set on the sha-ft in such relation that the are from o to o pressesupon roller h at the same time that the raised are a a presses roller i.As the cam R turns away from roller h, the bar E is drawn backward bythe spring m, which, owing to its inclined position, is effective indrawing the foar both downward and backward. throw of cam R determinesthe length of stitch, and in order to provide for regulating this atpleasure, the cam is made tapering or conoidal in form, with sufficientlength to permit of longitudinal movement on th e shaft, and therebyvary the extent of throw which will be given by it to the roller-arm.This longitudinal movement ofthe cam is effected by means of a spindleor rod, It', which extends from the outer or left-hand end of shaft B,(see Fig. 4,) through the tubular passage bin the shaft, to a pointunder or within the cam, the two being connected by a screw, r, passedthrough an elongated opening or slot, b. This screw r has the outer faceof its head conforming to the shape of the surrounding cam-surface withreference to securing smooth, continuous camface when the screw is home.To the same end the nick r in the screw-head is so made as to liclengthwise on the cam-face when home, thereby preventing possibility ofthe roller h catching in the nick or wearing it out of form.

In a chamber, 0"', in the outer end of shaft B is seated a tubularthumb-screw, l), which is secured in place by a pin, a, which is passedthrough holes a in an outer collar, P', and in shaft B, and through thegroove p, formed circumferentially in the outer surface of the barrel ofthe thumb-screw. The thumb-screw may thus be rotated without endwisemotion. The inner tube-surface of thumb -screw is threaded, as at p',and is screwed upon the threaded end 1" of rod It, so that rotation ofthe thumb-screw will move the rod and its attached cam Itlongitudinally, thereby effecting the desired adjustment of stitch.

All the parts of this feed mechanism are plain in form, can beconstructed cheaply, are easily pnt in place and adjusted, and when inplace will be durable and efficient.

I claim herein as my invention- 1. The feed-bar C, having in combinationa serrated face, c, in front, and two serrated faces, c c', one oneither side of its needleopening c3, and a narrow serrated face, c2, inthe rear, prolonged in the central line of the needle-opening beyond thetermination of the side faces, substantially as and for the purposes setforth.

2. The combination of feed-bar C, horizontally movable supporting bar E,carrying 'roller-arm H, conoidal cam R, hollow shaft B,

The extent of.

IOO

IIO

rod R', and thumb-screWvP, substantially as tally-movablesupporting-barE, carrying rol l-' and for the purposes set forth. 1 eer-arm H, spring m, shaft B, having tubular 3. The shaft B, havingtubular passage b, in passage b, adjusting-screw P, rod.R, conoidalcombination With rod R', cam R, secured to cam R, and screwsT o, forconnecting the 'rod 15 5 the rod, thumb-screw P, having an" inner andcam, substantially as set for-th,-

`thread, p, adapted to runon the threaded end In testimony whereof Ihave hereunto set r of the rod, and a circumferential groove, p, myhand. ou itsv outer surface, and apin, u, passed through the shaft andgroove, vsubstantially as Vit'nesses: 1o set forth. s l, C.V L, PARKER,

4; The combination of feed-bar O, horizony RKH. WHITTLEsEY.

SAMUEL R. sAueENT.

